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Startup Runway Calculator
Model your cash, burn, revenue growth, and next round. Know exactly when the tank hits empty — and when to start fundraising.
Startup inputs
Leave 0 to ignore.
Negative = cost cutting.
When the round lands, if planned.
Net monthly burn
—
Projected runway
—
—
Zero-cash date
—
After planned raise
—
Start fundraising by
—
Monthly cash forecast
Safe 3-month warning Critical
| Month | Burn | Revenue | Net burn | Cash end | Status |
|---|---|---|---|---|---|
| Click "Update runway" to generate forecast. | |||||
How this calculator works
- Net burn = monthly burn minus monthly revenue.
- Growth rates compound month over month for burn and revenue.
- Runway is how many months until cash hits zero, capped at 120 months.
- Fundraising adds the target amount to cash when the round closes.
- Start fundraising by is 6 months before zero-cash date.
What to do next
- • Pair with the AI Startup Cost Calculator to build a detailed burn model.
- • Use the LLM Cost Calculator to sanity-check your AI API spend.
- • Update assumptions monthly; even small revenue growth changes the zero-cash date.
- • Start investor conversations 6 months before you need the check.